Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense (benefit), reported	$ 11.4	$ 11.1	$ 31.6	$ (19.2)
Revaluation of net deferred income tax liability				(38.5)
Stock-based compensation - performance vesting				(15.4)
Income tax expense, excluding benefits			$ 31.6	$ 34.7
Income tax expense (benefit), reported	26.10%	24.80%	23.40%	(16.70%)
Revaluation of net deferred income tax liability				(33.40%)
Stock-based compensation - performance vesting				(13.40%)
Income tax expense, excluding benefits			23.40%	30.10%